<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="黑马头条"></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.name }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>
          <!-- 关注 -->
          <follow-user
            :user-id="article.aut_id"
            class="follow-btn"
            :isFollowed="article.is_followed"
            @update-is_followed="article.is_followed = $event"
          />
          <!-- 简写<v-model></v-model> -->
          <!-- value=article.is_followed -->
          <!-- @input="article.is_followed=$event" -->
          <!-- 第二种写法 -->
          <!-- <follow-user
            :user-id="article.aut_id"
            class="follow-btn"
           v-model="article.is_followed"
            @update-is_followed="article.is_followed = $event"
          /> -->
          <!-- 多个数据 -->
          <!-- <van-button
          模板中$event是事件参数
            v-if="article.is_followed"
            class="follow-btn"
            round
            size="small"
            @click="onFollow"
            :loading="followLoading"
            >已关注</van-button
          >
          <van-button
            v-else
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            :loading="followLoading"
            @click="onFollow"
            >关注</van-button
          > -->

          <!-- <follow-user></follow-user> -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          v-html="article.content"
          ref="article-content"
        ></div>
        <van-divider>正文结束</van-divider>

        <!-- 评论列表 -->
        <article-comment
          :source="article.art_id"
          @onload-success="totalComent = $event.total_count"
          :list="commentList"
          @reply-click="onReplyClick"
        />
        <!-- 评论列表 -->

        <!-- 底部区域 -->
        <div class="article-bottom">
          <!-- 写评论 -->
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="isCommentShow = true"
            >写评论</van-button
          >
          <!-- 弹出层从底部弹出 -->
          <van-icon
            name="comment-o"
            :info="totalComent"
            color="#777"
            class="comment-icon"
          />

          <!-- 收藏 -->
          <collect-article
            :article-id="article.art_id"
            class="btn-item"
            v-model="article.is_collected"
          />
          <!-- 收藏 -->

          <!-- 点赞 -->
          <lick-article
            class="btn-item"
            v-model="article.attitude"
            :article-id="article.art_id"
          />
          <!-- 点赞 -->
          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->
        <!-- 发布评论 -->
        <van-popup v-model="isCommentShow" position="bottom">
          <comment-list
            :target="article.art_id"
            @post-success="onPostSuccess"
          />
        </van-popup>
        <!-- 发布评论1 -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="errStatus === 404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadAricle">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 评论回复 -->
    <van-popup v-model="isReplyShow" style="height: 100%" position="bottom">
      <reply
        v-if="isReplyShow"
        :comment="currentComment"
        @close="isReplyShow = false"
      />
    </van-popup>
    <!-- 评论回复 -->
  </div>
</template>

<script>
import { getArticleById } from "@/api/article";
import { ImagePreview } from "vant";
import FollowUser from "@/views/article/components/follow-user.vue";
import CollectArticle from "./components/collect/index.vue";
import LickArticle from "./components/lick-article/index.vue";
import ArticleComment from "./components/article-comment.vue";
import CommentList from "./components/commentlist.vue";
import reply from "./components/reply.vue";

// ImagePreview({
//   images: [
//     'https://img01.yzcdn.cn/vant/apple-1.jpg',
//     'https://img01.yzcdn.cn/vant/apple-2.jpg',
//   ],
//   startPosition: 1,
// });
export default {
  name: "ArticleIndex",
  components: {
    FollowUser,
    CollectArticle,
    LickArticle,
    ArticleComment,
    CommentList,
    reply,
  },
  // 祖先给所有所有后代提供数据
  // 不能滥用
  provide: function () {
    return {
      // getMap: this.getMap,
      articleId: this.articleId,
    };
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true,
    },
  },
  data() {
    return {
      article: {}, //文章详情
      loading: true, //加载中load状态
      errStatus: 0, //失败状态吗
      followLoading: false,
      totalComent: 0,
      isCommentShow: false, //控制发布评论状态
      commentList: [], //评论列表
      isReplyShow: false, //评论回复弹层
      currentComment: {}, //当前点击回复评论项
    };
  },
  computed: {},
  watch: {},
  created() {
    this.loadArticle();
  },
  mounted() {},
  methods: {
    async loadArticle() {
      this.loading = true;
      // this.loadAricle = true;
      try {
        const { data } = await getArticleById(this.articleId);
        console.log(data);
        // if(Math.random()>0.5){
        //   JSON.parse(`dsankljdnskaljndlkjsa`)
        // }
        this.article = data.data;
        // 请求成功关闭load状态
        // this.loading = false;
        // 初始化图片点击预览
        console.log(this.$refs["article.content"]); //未定义
        setTimeout(() => {
          // console.log(this.$refs['article.content']);//未定义
          this.previewImage();
        }, 10);
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errStatus = 404;
        }
        console.log("获取文章详情失败");
      }

      this.loading = false; //关闭状态
    },
    // 图片预览
    previewImage() {
      //得到所有图片节点
      const articleContent = this.$refs["article-content"];
      const imgs = articleContent.querySelectorAll("img");
      const images = []; //所有img地址
      imgs.forEach((img, index) => {
        images.push(img.src);
        img.onclick = () => {
          ImagePreview({
            // 预览的图片地址数组
            images,
            // 图片起始位置
            startPosition: index,
          });
        };
      });
    },

    onPostSuccess(data) {
      // 弹层关闭
      this.isCommentShow = false;
      // 添加列表置顶
      this.commentList.unshift(data.new_obj);
    },
    // 回复弹出层
    onReplyClick(comment) {
      this.currentComment = comment;
      console.log(comment);
      this.isReplyShow = true; //显示评论回复弹出层
    },
  },
};
</script>
im
<style scoped lang="less">
@import "./github-markdown.css";

.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    /deep/ .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>